On the Korvaak/Chton point, both their circumstances (banished or forgotten) and their motivation (want to go back to/take over the world) are pretty much the same. To me it doesn't seem so much of a stretch that the same banished god is working on more than one plan to take over the world at the same time. If the chtonians fail (we kill log so they failed for now) there's always those religious fanatics to try something else.

Interesting point of view. But, if they're the same entity then why does Uroboruuk's notes mention Cthonian spawns heading east to investigate the strange energy?